Autoshutdown

At my office, my server will be on by me at 9am and will be close at 7pm...my server also act as a router..

there will be me only who know how to turn on and off the server...so I worried if one of the staff will shutdown my server by pressing off button and not the proper way by typing "halt"

is there any other way for me to set my Redhat9 automaticcaly shutdown completedly at 7pm? or second option is if i can set the server to be running on the spesific time perday, example the server will be down after 10 hour from the online time...

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